"The last conversation Kate had with him was this discussion about his medications and she warned him, "You can't mix drugs that you don't know anything about.""He said Katie, Katie, I'll be fine!" Well that's a cavalier boy's answer. It just put his whole system to sleep I guess."

Heath was 28 when he died from taking a combination of several different prescription medicines. The toxicology report that was released following an autopsy stated that the cause of death was "acute intoxication by the combined effects of oxycodone, hydrocodone, diazepam, temazepam, alprazolam and doxylamine."

Heartbreakingly, Kim also went on to admit that Heath's death was "totally his fault". He said:

"It was no-one elses. He reached for [the pills]. He put them in his system. You can't blame anyone else in that situation. That's hard to accept because I loved him so much and was so proud of him."

Since the Dark Knight actor's death, Kim has worked tirelessly to raise awareness about prescription medication misuse, particularly in his native Australia.

Celebrities, including co-star Jake Gyllenhaal and mother of his daughter, Michelle Williams, have also spoken of the huge impact Heath's death had on their lives.

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